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  <title>Astable Multivibrator with 555</title>
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  <meta content="Anantha Narayan" name="author">
  <meta content="An Interactive Calculator and Tutorial to learn Astable 555 Multivibrator" name="description">
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                        <td colspan="3" rowspan="1" valign="top">
                        <table border="0" cellpadding="1"
 cellspacing="1" width="100%">
                          <tbody>
                            <tr>
                              <td align="center" valign="middle">
                              <form name="freq_f" action=""> <input
 readonly="readonly" name="freq" size="10" value="0 Hz"> </form>
                              </td>
                              <td align="center" valign="middle">
                              <form name="period_f" action=""> <input
 readonly="readonly" name="period" size="10" value="0 S"> </form>
                              </td>
                              <td align="center" valign="middle">
                              <form name="duty_f" action=""> <input
 readonly="readonly" name="duty" size="10" value="0 "> </form>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><b>freq
&nbsp;Hz</b></td>
                              <td align="center" valign="middle"><b>period
Sec</b></td>
                              <td align="center" valign="middle"><b>duty
cycle</b></td>
                            </tr>
                          </tbody>
                        </table>
                        </td>
                      </tr>
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                        <td align="center" valign="middle">
                        <table align="center" border="0" cellpadding="1"
 cellspacing="1" width="100%">
                          <tbody>
                            <tr>
                              <td align="center" valign="middle">
                              <br/><a target="_blank" href="http://www.delabs-circuits.com/">delabs Circuits</a>  <br/>  <br/>
                              <img alt="" src="gifs/red_off.gif" name="power_led"  align="middle" height="28" width="28"><br>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><b>Power</b></td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle"><img src="gifs/red_button_up.gif" alt="" name="red_btn"
 onclick="not_toggle();" align="middle" height="39" width="44"> </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle"> <b>Ra</b>&nbsp; </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle">
                              <form name="ra_set" action=""><input
 readonly="readonly" name="ra_dsp" size="7" value="5"><br>
                                <input onclick="dec_ra(10);" value="&lt;&lt;"
 type="button"> <input onclick="dec_ra(1);" value=" &lt; " type="button">
                                <input onclick="inc_ra(1);" value=" &gt; "
 type="button"> <input onclick="inc_ra(10);" value="&gt;&gt;" type="button">
                                <br>
                                <br>
                                <select onchange="ra_range();"
 name="range_ra">
                                <option selected="selected" value="1000">kilo
ohms</option>
                                <option value="1000000">mega ohms</option>
                                </select>
                              </form>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle"><br>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle"><b>Rb&nbsp;</b> </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle">
                              <form name="rb_set" action=""> <input
 readonly="readonly" name="rb_dsp" size="7" value="100"> <br>
                                <input onclick="dec_rb(10);" value="&lt;&lt;"
 type="button"> <input onclick="dec_rb(1);" value=" &lt; " type="button">
                                <input onclick="inc_rb(1);" value=" &gt; "
 type="button"> <input onclick="inc_rb(10);" value="&gt;&gt;" type="button">
                                <br>
                                <br>
                                <select onchange="rb_range();"
 name="range_rb">
                                <option selected="selected" value="1000">kilo
ohms</option>
                                <option value="1000000">mega ohms</option>
                                </select>
                              </form>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle"><br>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle"><b>Ct&nbsp;</b> </td>
                            </tr>
                            <tr>
                              <td align="center" nowrap="nowrap"
 valign="middle">
                              <form name="ct_set" action=""><input
 readonly="readonly" name="ct_dsp" size="7" value="1"><br>
                                <input onclick="dec_ct(10);" value="&lt;&lt;"
 type="button"> <input onclick="dec_ct(1);" value=" &lt; " type="button">
                                <input onclick="inc_ct(1);" value=" &gt; "
 type="button"> <input onclick="inc_ct(10);" value="&gt;&gt;" type="button">
                                <br>
                                <br>
                                <select onchange="range_sel();"
 name="cap_range">
                                <option selected="selected"
 value="1000000">uF</option>
                                <option value="1000000000">nF</option>
                                </select>
                              </form>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                        </td>
                        <td valign="top"><img src="gifs/del00018.gif"
 alt="" height="502" width="530"></td>
                        <td align="center" valign="top">
                        <table border="0" cellpadding="1"
 cellspacing="1" width="100%">
                          <tbody>
                            <tr>
                              <td valign="top"><br>
                              </td>
                            </tr>
                            <tr>
                              <td valign="top"><br><br><br><br>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><b>LED1</b> </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><img alt=""
 src="gifs/green_off.gif" name="lo_led" align="middle" height="28"
 width="28"> </td>
                            </tr>
                            <tr>
                              <td valign="top"><br>
                              </td>
                            </tr>
                            <tr>
                              <td valign="top"><br>
                              </td>
                            </tr>
                            <tr>
                              <td valign="top"><br>
                              </td>
                            </tr>
                            <tr>
                              <td valign="top"><br>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><b>LED2</b> </td>
                            </tr>
                            <tr>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><img
 src="gifs/yellow_off.gif" alt="" name="hi_led" height="28" width="28"></td>
                            </tr>
                            <tr>
                              <td valign="top"> <br>
                              </td>
                            </tr>
                            <tr>
                              <td valign="top"><br>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><br>
                              <a target="_blank" href="http://www.dapj.com/">dapj Tech</a>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><br>
                              </td>
                            </tr>
                            <tr>
                              <td align="center" valign="middle"><br>
                              </td>
                            </tr>
                          </tbody>
                        </table>
                        </td>
                      </tr>
                    </tbody>
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